add test

apps/app/playwright/21-basic-features-for-guest/access-to-page.spec.ts

@@ -0,0 +1,9 @@
+import { test, expect } from '@playwright/test';
+
+test('/Sandbox is successfully loaded', async({ page }) => {
+
+  await page.goto('/Sandbox');
+
+  // Expect a title "to contain" a substring.
+  await expect(page).toHaveTitle(/Sandbox/);
+});